2002 Fiscal Year Final Research Report Summary
New Development of Studies on Chemical Reactions in Ultrapure Quantum Solid Hydrogen at Very Low Temperature
| Project/Area Number |
13640507
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | Graduate School of Engineering, Nagoya University |
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Principal Investigator |
MIYAZAKI Tetsuo Graduate School of Engineering, Nagoya University, Professor, 工学研究科, 教授 (90023126)
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| Co-Investigator(Kenkyū-buntansha) |
KUMAGAI Jun Graduate School of Engineering, Nagoya University, Associate Professor, 工学研究科, 講師 (20303662)
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| Project Period (FY) |
2001 – 2002
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| Keywords | H atom / Very low temperature / High resolution ESR / Solid parahydrogen / Tunneling reaction / Quantum solid / Ethyl radical / Recombination reaction |
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| Research Abstract |
(1) High Resolution ESR Spectroscopy at Very Low Temperature
The author proposed high resolution ESR spectroscopy by use of ultrapure solid parahydrogen. Since parahydrogen has no nuclear magnetic moments, there exist no superhyperfine interactions of a free radical with parahydrogen molecules, resulting in the very narrow ESR spectrum. For example, ESR spectrum of ethyl radicals in solid parahydrogen consists of 23 narrow lines. The structure of radicals at very low temperature can be analyzed exactly by use of this high resolution ESR spectroscopy.
(2) Effect of Energy Dissipation on Tunneling Reaction in Solid Parahydrogen
Untrapure solid parahydrogen is a very deficient energy acceptor like vacuum because of the lack of its interactions with reactants. The author discovered that the energy dissipation controls drastically the tunneling recombination reaction of H atoms and electron bubbles in ultapure solid parahydrogen. This is the first evidence for the effect of energy dissipation on tunneling reactions.
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